--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-sidedata.t	Wed Sep 04 02:43:17 2019 +0200
@@ -0,0 +1,65 @@
+==========================================================
+Test file dedicated to checking side-data related behavior
+==========================================================
+
+
+Check upgrade behavior
+======================
+
+Right now, sidedata has not upgrade support
+
+Check that we cannot upgrade to sidedata
+----------------------------------------
+
+  $ hg init up-no-side-data --config format.use-side-data=no
+  $ hg debugformat -v -R up-no-side-data
+  format-variant    repo config default
+  fncache:           yes    yes     yes
+  dotencode:         yes    yes     yes
+  generaldelta:      yes    yes     yes
+  sparserevlog:      yes    yes     yes
+  sidedata:           no     no      no
+  plain-cl-delta:    yes    yes     yes
+  compression:       zlib   zlib    zlib
+  compression-level: default default default
+  $ hg debugformat -v -R up-no-side-data --config format.use-side-data=yes
+  format-variant    repo config default
+  fncache:           yes    yes     yes
+  dotencode:         yes    yes     yes
+  generaldelta:      yes    yes     yes
+  sparserevlog:      yes    yes     yes
+  sidedata:           no    yes      no
+  plain-cl-delta:    yes    yes     yes
+  compression:       zlib   zlib    zlib
+  compression-level: default default default
+  $ hg debugupgraderepo -R up-no-side-data --config format.use-side-data=yes
+  abort: cannot upgrade repository; do not support adding requirement: exp-sidedata-flag
+  [255]
+
+Check that we cannot upgrade to sidedata
+----------------------------------------
+
+  $ hg init up-side-data --config format.use-side-data=yes
+  $ hg debugformat -v -R up-side-data
+  format-variant    repo config default
+  fncache:           yes    yes     yes
+  dotencode:         yes    yes     yes
+  generaldelta:      yes    yes     yes
+  sparserevlog:      yes    yes     yes
+  sidedata:          yes     no      no
+  plain-cl-delta:    yes    yes     yes
+  compression:       zlib   zlib    zlib
+  compression-level: default default default
+  $ hg debugformat -v -R up-side-data --config format.use-side-data=no
+  format-variant    repo config default
+  fncache:           yes    yes     yes
+  dotencode:         yes    yes     yes
+  generaldelta:      yes    yes     yes
+  sparserevlog:      yes    yes     yes
+  sidedata:          yes     no      no
+  plain-cl-delta:    yes    yes     yes
+  compression:       zlib   zlib    zlib
+  compression-level: default default default
+  $ hg debugupgraderepo -R up-side-data --config format.use-side-data=no
+  abort: cannot upgrade repository; requirement would be removed: exp-sidedata-flag
+  [255]